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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2014 Apr 25 1246 UTC

SIDC Forecast

Valid from 1230 UTC, 25 Apr 2014 until 27 Apr 2014
Brillamenti solari

Eruptive (C-class flares expected, probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

10cm fluxAp
25 Apr 2014127006
26 Apr 2014125007
27 Apr 2014125012

Bulletin

NOAA 2035, already behind the west limb, produced an X1.3 flare peaking at 00:27 UT. No obvious proton flux increase has been observed so far. The event was accompanied by an EIT-wave towards the south (PROBA2/SWAP) and a CME (SOHO/LASCO and STEREO). The CME has a speed of about 500 km/s (CACTUS) and is directed away from Earth. There are currently 5 sunspot regions on disk. They are all quite small and have a quite simple magnetic configuration. An active region, responsible for backside CMEs on 22 and 25 April, is approaching the southeast limb. There's still a chance on a C-class flare, in particular from the regions near the solar limb. There's a decreasing chance on a strong flare from NOAA 2035 as it rotates further onto the Sun's farside. Solar wind speed varied between 400 and 500km/s, and Bz between -5 and +4nT being mostly negative between 21:00 and 01:00UT. Hence, quiet geomagetic conditions were observed, with locally a brief active period. A small equatorial coronal hole passed the central meridian last night. The geomagnetic field may be impacted starting around 27 April. Geomagnetic conditions are expected to be quiet, with locally a brief active interval possible.

Today's estimated international sunspot number (ISN): 046, based on 13 stations.

Solar indices for 24 Apr 2014

Wolf number Catania///
10cm solar flux130
AK Chambon La Forêt020
AK Wingst017
Estimated Ap015
Estimated international sunspot number053 - Based on 22 stations

Noticeable events summary

25 0017 0027 0038 S15/// X1.3 SF 1100 ///2035 V/1II/2
DayBeginMaxFineLocStrengthOP10cmCatania/NOAARadio burst types

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

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